The following databases are good starting points for finding articles about Poverty. Some keywords you could use to begin your search are poverty and "United States"
These sites are excellent sources for information and further links.
The Center for Poverty Research at the University of California, Davis
The Institute for Research on Poverty at the University of Wisconsin-Madison
The Joint Center for Poverty Research of Northwestern University and the University of Chicago
The Kentucky Center for Poverty Research at the University of Kentucky
The National Poverty Center at the University of Michigan
The RUPRI Rural Poverty Research Center at the University of Iowa
The West Coast Poverty Research Center at the University of Washington